[c-nsp] CPU utilization for handling interrupt

[Waseem]

I'm not receiving that log, I have nearly 600Mbps on this link, nearly 3 - 6 Mbps is being process switched from this link only, I tried to disable it, the CPU due to interrupt got 0%.

please check the following packets.
--------------------------------------------------------------

interface Gi1/9, routine process_rx_packet_inline
dbus info: src_vlan 0x406(1030), src_indx 0x8(8), len 0x42(66)
  bpdu 0, index_dir 0, flood 0, dont_lrn 0, dest_indx 0x380(896)
  B8020401 04060000 00080000 42000000 00060530 0E000040 00000000 03800000
destmac 00.1E.13.E4.A2.00, srcmac 00.25.9E.20.7A.D0, protocol 0800
protocol ip: version 0x04, hlen 0x05, tos 0x00, totlen 48, identifier 6637
  df 1, mf 0, fo 0, ttl 126, src 109.127.86.37, dst 209.85.145.105
    tcp src 63915, dst 80, seq 2253251144, ack 0, win 16384 off 7 checksum 0xBA29 syn
---------------------------------------------------------------
interface Gi1/9, routine naboo_fastsend
dbus info: src_vlan 0x406(1030), src_indx 0x380(896), len 0x46(70)
  bpdu 0, index_dir 0, flood 0, dont_lrn 0, dest_indx 0x380(896)
  00020000 04062800 03800000 46000000 00060560 00000040 00000000 03800000
destmac 00.25.9E.20.7A.D0, srcmac 00.1E.13.E4.A2.00, protocol 0800
layer 3 data: 45000034 5DCA4000 3706F051 57F8D9C0 6D7F5670 005052A5
              845F754B EC784102 8012FFFF 00E20000 02040514 01030304
              04020000 001E688A 00000413 00000340 0000
----------------------------------------------------------------
interface Gi1/9, routine process_rx_packet_inline
dbus info: src_vlan 0x406(1030), src_indx 0x8(8), len 0x42(66)
  bpdu 0, index_dir 0, flood 0, dont_lrn 0, dest_indx 0x380(896)
  E0020401 04060000 00080000 42000000 00060520 0E000040 00000000 03800000
destmac 00.1E.13.E4.A2.00, srcmac 00.25.9E.20.7A.D0, protocol 0800
protocol ip: version 0x04, hlen 0x05, tos 0x00, totlen 48, identifier 7783
  df 1, mf 0, fo 0, ttl 126, src 109.127.86.8, dst 95.211.87.169
    tcp src 29827, dst 80, seq 2269663441, ack 0, win 8192 off 7 checksum 0x9B2E syn
-----------------------------------------------------------------

interface Gi1/9, routine process_rx_packet_inline
dbus info: src_vlan 0x406(1030), src_indx 0x8(8), len 0x4E(78)
  bpdu 0, index_dir 0, flood 0, dont_lrn 0, dest_indx 0x380(896)
  10020401 04060000 00080000 4E000000 00060550 0E000040 00000000 03800000
destmac 00.1E.13.E4.A2.00, srcmac 00.25.9E.20.7A.D0, protocol 0800
protocol ip: version 0x04, hlen 0x05, tos 0x00, totlen 60, identifier 28750
  df 1, mf 0, fo 0, ttl 126, src 109.127.86.29, dst 207.66.182.20
    tcp src 58557, dst 80, seq 2150691164, ack 0, win 8192 off 10 checksum 0xD911 syn
------------------------------------------------------------------

those are captured from dumping the CPU.
do you find anything that make them need special handling?

regards,
Waseem



________________________________
From: Nick Hilliard <nick at foobar.org>
To: Waseem <waseem_aliraqi at yahoo.com>
Cc: NSP <cisco-nsp at puck.nether.net>
Sent: Wednesday, October 5, 2011 3:20 PM
Subject: Re: [c-nsp] CPU utilization for handling interrupt

On 05/10/2011 12:15, Waseem wrote:
> It is a regular internet traffic to port 80, from our customers, which should be CEF switched.

Sounds like your router is punting all traffic.  Are you seeing the
following errors in your logs?

> %CFIB-SP-7-CFIB_EXCEPTION : FIB TCAM exception, Some entries will be software switched 

If this is the case, you need to drop the number of routes that the box is
handling, and then reboot the system.  Once the FIB limits are exceeded on
this platform, rebooting is the only way to revert to hardware forwarding.

Nick